Tata Sons' Chandrasekaran resigns amid tension with group's controlling charity arm
By Aditya Kalra NEW DELHI, Aug 12 (Reuters) - The chairman of India's Tata Sons, N. Chandrasekaran, said on Wednesday that he has resigned in light of the lack of board approval for his reappointment amid tensions with the charity arm that controls the salt-to-aviation Tata Group.